Small fish delivery business restructures (5-3)
I believe the answer is:
shake-ups
'small fish delivery business restructures' is the definition.
I can't judge whether this definition defines the answer.
'small fish delivery business' is the wordplay.
'small' becomes 's' (abbreviation - e.g. clothes size).
'fish' becomes 'hake' (hake is a kind of fish).
'delivery business' becomes 'ups' (I can't justify this - if you can you should believe this answer much more).
's'+'hake'+'ups'='SHAKE-UPS'
Can you help me to learn more?
(Other definitions for shake-ups that I've seen before include "Upheavals or re-organisations" , "Shuffles" .)